JPS5517825A - Music-interval detector for record player - Google Patents
Music-interval detector for record playerInfo
- Publication number
- JPS5517825A JPS5517825A JP8888578A JP8888578A JPS5517825A JP S5517825 A JPS5517825 A JP S5517825A JP 8888578 A JP8888578 A JP 8888578A JP 8888578 A JP8888578 A JP 8888578A JP S5517825 A JPS5517825 A JP S5517825A
- Authority
- JP
- Japan
- Prior art keywords
- record
- light emitting
- emitting diode
- output
- reflected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To make a fixed output generate to prevent error operation of a music interval detector in spite of up-and-down vibration of a record, which is generated by the deformation of the record or its equivalent during the rotation of record, by setting photo-detecting means and the 1st and 2nd light emitting diodes in the neighborhood of the needle point of pick-up arm.
CONSTITUTION: The 1st light emitting diode 2a is set so that the output of photo detector 3, which corresponds to the reflected light reflected on the surface of record 8 located on the 1st position separated distance l1 from 1st light emitting diode 2a, may reach max. value. The 2nd light emitting diode 2b is set so that the output of photo detector 3, which corresponds to the reflected light reflected on the surface of record 8 located on the 2nd position separated distance l2 from the 2nd light emitting diode 2a, may reach max. value. Therefore, photo detector 3 can generate fixed output C within the range between distance l1 and l2 even when record 8 vibrates up-and-down by the reasons such the deformation of record during the rotation of record.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8888578A JPS5517825A (en) | 1978-07-20 | 1978-07-20 | Music-interval detector for record player |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8888578A JPS5517825A (en) | 1978-07-20 | 1978-07-20 | Music-interval detector for record player |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5517825A true JPS5517825A (en) | 1980-02-07 |
Family
ID=13955430
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8888578A Pending JPS5517825A (en) | 1978-07-20 | 1978-07-20 | Music-interval detector for record player |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5517825A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57203255A (en) * | 1981-06-08 | 1982-12-13 | Pioneer Electronic Corp | Intermusic detector of record player |
JPS623462A (en) * | 1985-06-28 | 1987-01-09 | Matsushita Electric Ind Co Ltd | Reflecting type sensor for music selecting record player |
-
1978
- 1978-07-20 JP JP8888578A patent/JPS5517825A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57203255A (en) * | 1981-06-08 | 1982-12-13 | Pioneer Electronic Corp | Intermusic detector of record player |
JPS623462A (en) * | 1985-06-28 | 1987-01-09 | Matsushita Electric Ind Co Ltd | Reflecting type sensor for music selecting record player |
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